Could not establish trust relation ship

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When I am purchasing a product at payment page am getting error with sandbox The following error is the error message I got.
"The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel"
When i gone through the i found it is because of new updates by What are the changes I need to do related to those updates at code level and server.
Hello, Sorry for the problem with The issue you're facing has to do with the updates that Here's a summary of them:
  • Certificate store must includes certificates for Root 2 - GeoTrust Global CA
  • Security transport— the part that negotiates TLS— must support SHA-256
  • Firewall is not set to whitelist Authorize.Net IP addresses for outbound connections
  • Plugin/Extension/Module should not connect directly to Authorize.Net using an IP address

Certificates purchased through Web Hosting Hub meet three of the requirements. The fourth requirement is a parameter specified within configuration used by the plugin/extension/module making the connection to InMotion Hosting is not responsible for the configuration of the application/module/plugin/extension used to connect to You will most likely need to contact the module/plugin/extension developer for an update.

I hope this helps to answer your question, please let us know if you require any further assistance. Regards, Arnel C.